Neo4j数据未显示在Web控制台中

时间：2014-03-25 05:30:51

标签： java neo4j

我正在尝试编写一个程序来获取数据并将其输入到Neo4j数据库中。该程序似乎运行良好 - 我说它运行没有问题和

System.out.println(node.getProperty("Name"));

行返回我创建的每个节点的值。然而，当我进入Web控制台时，我没有在数据库中看到任何这些节点。我很肯定我正在把它写到正确的目录中。执行ls -l表示每次运行程序时都会修改数据库：

new-host-4:new_graph.db USER$ ls -l
total 504
-rw-r--r--  1 USER  wheel      11 Mar 25 00:55 active_tx_log
drwxr-xr-x  8 USER  wheel     272 Mar 25 01:21 index
-rw-r--r--  1 USER  wheel  111766 Mar 25 01:21 messages.log
-rw-r--r--  1 USER  wheel      78 Mar 25 01:21 neostore
-rw-r--r--  1 USER  wheel       9 Mar 25 01:21 neostore.id
-rw-r--r--  1 USER  wheel      22 Mar 25 01:21 neostore.labeltokenstore.db
-rw-r--r--  1 USER  wheel       9 Mar 25 01:21 neostore.labeltokenstore.db.id
-rw-r--r--  1 USER  wheel      64 Mar 25 01:21 neostore.labeltokenstore.db.names
-rw-r--r--  1 USER  wheel       9 Mar 25 01:21 neostore.labeltokenstore.db.names.id
-rw-r--r--  1 USER  wheel     100 Mar 25 01:21 neostore.nodestore.db
-rw-r--r--  1 USER  wheel      41 Mar 25 01:21 neostore.nodestore.db.id
-rw-r--r--  1 USER  wheel      93 Mar 25 01:21 neostore.nodestore.db.labels
-rw-r--r--  1 USER  wheel       9 Mar 25 01:21 neostore.nodestore.db.labels.id
-rw-r--r--  1 USER  wheel     635 Mar 25 01:21 neostore.propertystore.db
-rw-r--r--  1 USER  wheel     153 Mar 25 01:21 neostore.propertystore.db.arrays
-rw-r--r--  1 USER  wheel       9 Mar 25 01:21 neostore.propertystore.db.arrays.id
-rw-r--r--  1 USER  wheel       9 Mar 25 01:21 neostore.propertystore.db.id
-rw-r--r--  1 USER  wheel      43 Mar 25 01:21 neostore.propertystore.db.index
-rw-r--r--  1 USER  wheel       9 Mar 25 01:21 neostore.propertystore.db.index.id
-rw-r--r--  1 USER  wheel     140 Mar 25 01:21 neostore.propertystore.db.index.keys
-rw-r--r--  1 USER  wheel       9 Mar 25 01:21 neostore.propertystore.db.index.keys.id
-rw-r--r--  1 USER  wheel     154 Mar 25 01:21 neostore.propertystore.db.strings
-rw-r--r--  1 USER  wheel       9 Mar 25 01:21 neostore.propertystore.db.strings.id
-rw-r--r--  1 USER  wheel      57 Mar 25 01:21 neostore.relationshipstore.db
-rw-r--r--  1 USER  wheel       9 Mar 25 01:21 neostore.relationshipstore.db.id
-rw-r--r--  1 USER  wheel      33 Mar 25 01:21 neostore.relationshiptypestore.db
-rw-r--r--  1 USER  wheel       9 Mar 25 01:21 neostore.relationshiptypestore.db.id
-rw-r--r--  1 USER  wheel     102 Mar 25 01:21 neostore.relationshiptypestore.db.names
-rw-r--r--  1 USER  wheel       9 Mar 25 01:21 neostore.relationshiptypestore.db.names.id
-rw-r--r--  1 USER  wheel      82 Mar 25 01:21 neostore.schemastore.db
-rw-r--r--  1 USER  wheel       9 Mar 25 01:21 neostore.schemastore.db.id
-rw-r--r--  1 USER  wheel       4 Mar 25 01:21 nioneo_logical.log.active
-rw-r--r--  1 USER  wheel     856 Mar 25 00:55 nioneo_logical.log.v0
-rw-r--r--  1 USER  wheel     464 Mar 25 00:57 nioneo_logical.log.v1
-rw-r--r--  1 USER  wheel     316 Mar 25 01:05 nioneo_logical.log.v2
-rw-r--r--  1 USER  wheel     316 Mar 25 01:21 nioneo_logical.log.v3
drwxr-xr-x  3 USER  wheel     102 Mar 25 00:55 schema
-rw-r--r--  1 USER  wheel       0 Mar 25 00:55 store_lock
-rw-r--r--  1 USER  wheel     500 Mar 25 01:21 tm_tx_log.1
new-host-4:new_graph.db USER$ pwd
/usr/local/Cellar/neo4j/2.0.1/libexec/data/new_graph.db

然而，当我进入 START a = node(*) RETURN a;

我没有节点。如果我在此数据库上运行EmbeddedNeo4j.java示例，那么这些节点将显示在数据库中，但不会显示在这些节点中。控制台配置设置显示相同的目录enter image description here

我错过了什么或是否有Neo4J的错误？

供参考，我正在使用的课程如下。主调用测试器，它打开一个流。 Stream获取数据库的句柄，并在将规则应用于输入（未显示）后，使用NeoProcessor创建条目。这些属性会毫无问题地打印到控制台，这让我相信它们已被写入数据库，但我从未在Web控制台中看到它们。

我的主要人物：

public class NeoTest {


    public static void main( final String[] args )
    {


        //Our tester to test the database
        Tester myTest = new Tester("Stream");

        try{
            myTest.fileTester("/Users/me/data/test");
            myTest.end();
        }
        catch (IOException ex)
        {
            System.out.println("Cannot open file fool");
        }

    }


}

我的测试员：

public class Tester {

    private Streamer myStream;
    private String inputType;

    public Tester(String inputType)
    {
        this.inputType = inputType;
        if(inputType.toLowerCase().contains("Stream".toLowerCase()))
        {
            System.out.println("Using Stream");
            // instantiate streamer
            myStream = new Streamer();
            //get DB going
            myStream.openStream("calllog");
        }
    }

    public void fileTester(String fileName) throws IOException
    {
        System.out.println("hi");
        BufferedReader in = new BufferedReader(new FileReader(fileName));

        while(in.ready())
        {
            String s = in.readLine();
            myStream.streamInput(s);
        }
        in.close();
    }

    public void end()
    {
        if(inputType.toLowerCase().contains("Stream".toLowerCase()))
                myStream.closeStream();
    }

}

我的处理程序是：

public class NeoHandle {

    private static GraphDatabaseService graphDb;
    private String DB_PATH = "/usr/local/Cellar/neo4j/2.0.1/libexec/data/new_graph.db";

    NeoHandle()
    {
        this.graphDb = new GraphDatabaseFactory().newEmbeddedDatabase( DB_PATH );
    }


    public GraphDatabaseService getNeoHandle()
    {
        return graphDb;
    }

    public void createDb()
    {
        // START SNIPPET: startDb
        registerShutdownHook( graphDb );
        // END SNIPPET: startDb
    }

    private static void registerShutdownHook( final GraphDatabaseService graphDb )
    {
        // Registers a shutdown hook for the Neo4j instance so that it
        // shuts down nicely when the VM exits (even if you "Ctrl-C" the
        // running application).
        Runtime.getRuntime().addShutdownHook( new Thread()
        {
            @Override
            public void run()
            {
                graphDb.shutdown();
            }
        } );
    }

    public void shutDown()
    {
        System.out.println();
        System.out.println( "Shutting down database ..." );
        // START SNIPPET: shutdownServer
        graphDb.shutdown();
        // END SNIPPET: shutdownServer
    }
}

我的流光是：

public class Streamer {

    private NeoHandle myHandle;

    private String contextType;

    Streamer()
    {

    }


    public void openStream(String contextType)
    {
        myHandle = new NeoHandle();
        myHandle.createDb();
    }

    public void streamInput(String dataLine)
    {
        LinkedList context = new LinkedList();
        /*
         * get database instance
         * write to database
         * check for errors
         * report errors & success
         */
        System.out.println(dataLine);

        //apply rules to data (make ContextRules do this, send type and string of data)
        ContextRules contextRules = new ContextRules();
        context = contextRules.processContextRules("Calls", dataLine);

        //write data (using linked list from contextRules)
        NeoProcessor processor = new NeoProcessor(myHandle);
        processor.processContextData(context);
    }

    public void closeStream()
    {
        /*
         * close database instance
         */
        myHandle.shutDown();
    }

}

我的处理器是：

public class NeoProcessor {

    private NeoHandle handle;

    public NeoProcessor(NeoHandle handle)
    {
        this.handle = handle;
    }

    public void processContextData(LinkedList context)
    {
        for(Object c : context)
        {
            if(c instanceof Entity)
            {
                Node node = addNode((Entity)c);
                ((Entity)c).setNode(node);          
            }

        }
    }

    public Node addNode(Entity myNode)
    {   
        //TODO - wrap in transaction
        GraphDatabaseService graphDb = this.handle.getNeoHandle();

        Node node;


        try ( Transaction tx = graphDb.beginTx() )
        {
            node = graphDb.createNode();
            if(myNode.hasName()) 
                {
                System.out.println("setting name");
                node.setProperty("Name", myNode.getName());
                System.out.println(node.getProperty("Name"));
                }

        }//try transaction  

        return node;
    }
}

1 个答案:

答案 0 :(得分：0)

我遗漏了NeoProcessor中的tx.success()调用。当我在事务中包装它时，我必须提交事务。

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